<!DOCTYPE html>
<html>
<head>
<style type="text/css">

body { font-size: 1600000px; }
body * { font-size: 10em; }

</style>
</head>

<body>
  <div>
    <div style="margin-top: 1em; margin-bottom: 1em;">A</div>
  </div>
  <div>
    <div style="margin-top: 1em; margin-bottom: 1em;">B<div style="display: list-item; padding-left: 3px; float: left;"></div></div>
  </div>
  <div style="float: left;"></div>
</body>

</html>
